Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	5516 Photoresistor Module
Pin Count	4-Pin Interface
Operating Voltage	3.3V - 5V DC
Output Signal	Digital Switch (DO) & Analog (AO)
Detection Component	Photoresistor (LDR)
Adjustable Sensitivity	Yes, via Potentiometer
Indicator LED	Power and Status LEDs included
PCB Dimensions	32mm x 14mm
Mounting Hole Diameter	3.0mm
Application Scope	Arduino, Raspberry Pi, DIY Electronics

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Exceeded expectations

For such a low cost, the build quality is impressive. The PCB is thick enough to not flex easily, and the components are well-soldered. It detected light changes accurately in my test setup involving a shadow counter.

Anonymous

Mar 24, 2026

Rating: 4/5

Good value, clear instructions needed

The hardware quality is solid for the price. The soldering points are clean and the pins are sturdy. However, it would be nice if there was a pinout diagram printed on the back. Once I figured out the DO and AO pins, it worked great.

Anonymous

Mar 21, 2026

Rating: 5/5

Compact and efficient

Small footprint fits perfectly into my enclosure. The analog output allows for more granular light level reading if you need it, but the digital switch mode is what I primarily use. Very satisfied with this purchase.

Anonymous

Mar 16, 2026

Rating: 4/5

Great for learning

Used this for a university electronics assignment. It helped me understand how photoresistors interface with microcontrollers. The only minor issue is that the comparator chip gets slightly warm, but nothing concerning.

Anonymous

Mar 13, 2026

Rating: 5/5

Perfect for my Arduino light project

This sensor module works exactly as described. The sensitivity adjustment potentiometer makes it very easy to calibrate for different lighting conditions. I used it to trigger an LED strip when the room gets dark, and it responded instantly.

Anonymous

Mar 10, 2026

Rating: 5/5

Reliable detection

I bought three of these for a home automation prototype. All three performed consistently. The digital output is clean with no bouncing issues, which saved me time on software debouncing. Highly recommended for beginners.

5 FAQ

Q: Is the mounting hole size standard for M3 screws?

A: The mounting holes are approximately 3.0mm in diameter, which is suitable for M3 screws or can be used with standoffs for securing the board to your project chassis.

Q: What is the difference between the DO and AO pins?

A: AO (Analog Output) provides a variable voltage corresponding to the light intensity, while DO (Digital Output) acts as a switch that goes high or low based on a threshold set by the onboard potentiometer.

Q: Can this sensor detect infrared light?

A: This module uses a standard photoresistor which is primarily sensitive to visible light. It is not optimized for detecting infrared signals; for IR, we recommend our specific IR receiver modules.

Q: How do I adjust the sensitivity threshold?

A: You can adjust the sensitivity by turning the blue potentiometer on the board clockwise or counter-clockwise while exposing the sensor to your target light condition until the status LED toggles as desired.

Q: Does this module work with 3.3V logic levels like ESP32?

A: Yes, this module operates comfortably within the 3.3V to 5V range, making it fully compatible with ESP32, ESP8266, Arduino, and Raspberry Pi GPIO pins.

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